Convert bag file to a common pointcloud format

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OS: Ubuntu 18.04

Lidar: Livox Mid 40

Hello,

im using livox mid 40 which export point cloud to .lvx files or rosbags. I am looking for a way to convert these files to a common pointcloud format like ply, las, laz so i can use it to programs like cloudcompare, meshlab or other. I saw the other answers on the site about rosrun pcl_ros bag_to_pcd <input_file.bag> <topic> <output_directory> or cloud_assembler but the first one creates multiple pcds and not a single point cloud and the second one doesnt work as you can see here link text on other issue. Im really confused!!

Any help would be appreciated.